| 'use strict'; |
| |
| var toStr = Object.prototype.toString; |
| |
| var isPrimitive = require('./helpers/isPrimitive'); |
| |
| var isCallable = require('is-callable'); |
| |
| // https://es5.github.io/#x8.12 |
| var ES5internalSlots = { |
| '[[DefaultValue]]': function (O, hint) { |
| var actualHint = hint || (toStr.call(O) === '[object Date]' ? String : Number); |
| |
| if (actualHint === String || actualHint === Number) { |
| var methods = actualHint === String ? ['toString', 'valueOf'] : ['valueOf', 'toString']; |
| var value, i; |
| for (i = 0; i < methods.length; ++i) { |
| if (isCallable(O[methods[i]])) { |
| value = O[methods[i]](); |
| if (isPrimitive(value)) { |
| return value; |
| } |
| } |
| } |
| throw new TypeError('No default value'); |
| } |
| throw new TypeError('invalid [[DefaultValue]] hint supplied'); |
| } |
| }; |
| |
| // https://es5.github.io/#x9 |
| module.exports = function ToPrimitive(input, PreferredType) { |
| if (isPrimitive(input)) { |
| return input; |
| } |
| return ES5internalSlots['[[DefaultValue]]'](input, PreferredType); |
| }; |